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<?php |
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namespace FunctionalPHP\PatternMatching; |
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class Parser |
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{ |
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protected $reserved = ['true', 'false']; |
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protected $rules = [ |
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'/^(true|false)$/i' => '_parseBooleanConstant', |
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'/^([\'"])(?:(?!\\1).)*\\1$/' => '_parseStringConstant', |
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'/^[a-zA-Z]+$/' => '_parseIdentifier', |
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'/^_$/' => '_parseWildcard', |
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'/^\\[.*\\]$/' => '_parseArray', |
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'/^\\(.+:.+\\)$/' => '_parseCons', |
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'/^[a-zA-Z]+@.+$/' => '_parseAs', |
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]; |
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protected function _parseNumericConstant($value, $pattern) |
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{ |
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return is_numeric($value) && $pattern == $value ? [] : false; |
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} |
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protected function _parseBooleanConstant($value, $pattern) |
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{ |
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$pattern_value = strtoupper($pattern) === 'TRUE' ? true : false; |
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return is_bool($value) && $value === $pattern_value ? [] : false; |
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} |
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protected function _parseStringConstant($value, $pattern) |
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{ |
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$string_pattern = substr($pattern, 1, -1); |
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return is_string($value) && $string_pattern == $value ? [] : false; |
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} |
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protected function _parseIdentifier($value, $pattern) |
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{ |
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return in_array(strtolower($pattern), $this->reserved) ? false : [$pattern => $value]; |
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} |
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protected function _parseWildcard() |
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{ |
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return []; |
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} |
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protected function _parseArray($value, $pattern) |
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{ |
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$patterns = $this->_split(',', '[', ']', substr($pattern, 1, -1)); |
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if(count($patterns) === 0) { |
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return count($value) === 0 ? [] : false; |
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} |
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return $this->_recurse($value, $patterns); |
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} |
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protected function _parseCons($value, $pattern) |
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{ |
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$patterns = $this->_split(':', '(', ')', substr($pattern, 1, -1)); |
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$last_pattern = array_pop($patterns); |
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if(! is_array($value)) { |
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return false; |
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} |
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return $this->_mergeResults( |
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$this->parse(array_splice($value, count($patterns)), $last_pattern), |
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$this->_recurse($value, $patterns) |
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); |
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} |
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protected function _parseAs($value, $pattern) |
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{ |
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$patterns = explode('@', $pattern, 2); |
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$rest = $this->parse($value, $patterns[1]); |
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return $this->_mergeResults([$patterns[0] => $value], $rest); |
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} |
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/** |
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* @param mixed $value |
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* @param string $pattern |
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* @return bool|array |
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*/ |
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public function parse($value, $pattern) |
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{ |
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$pattern = trim($pattern); |
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if(is_numeric($pattern)) { |
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return $this->_parseNumericConstant($value, $pattern); |
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} |
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// a true value will mean that no regex matched |
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// a false value will mean that at least one regex matched but the pattern didn't |
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// anything else is the result of the pattern matching |
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$result = array_reduce(array_keys($this->rules), function($current, $regex) use($value, $pattern) { |
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return $this->_updateParsingResult($value, $pattern, $regex, $current); |
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}, true); |
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if($result === true) { |
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$this->_invalidPattern($pattern); |
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} |
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return $result; |
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} |
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protected function _updateParsingResult($value, $pattern, $regex, $current) |
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{ |
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if(is_bool($current) && preg_match($regex, $pattern)) { |
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$current = call_user_func_array([$this, $this->rules[$regex]], [$value, $pattern]); |
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} |
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return $current; |
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} |
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protected function _split($delimiter, $start, $stop, $pattern) |
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{ |
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$result = split_enclosed($delimiter, $start, $stop, $pattern); |
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if($result === false) { |
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$this->_invalidPattern($pattern); |
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} |
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return $result; |
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} |
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protected function _recurse($value, $patterns) |
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{ |
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if(! is_array($value) || count($patterns) > count($value)) { |
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return false; |
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} |
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return array_reduce($patterns, function($results, $p) use(&$value) { |
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return $this->_mergeResults($results, $this->parse(array_shift($value), $p)); |
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}, []); |
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} |
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protected function _mergeResults($new, $current) |
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{ |
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if($new === false || $current === false) { |
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return false; |
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} |
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$common = array_intersect_key($current, $new); |
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if(count($common) > 0) { |
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throw new \RuntimeException(sprintf('Non unique identifiers: "%s".', implode(', ', array_keys($common)))); |
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} |
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return array_merge($current, $new); |
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} |
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protected function _invalidPattern($pattern) |
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{ |
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throw new \RuntimeException(sprintf('Invalid pattern "%s".', $pattern)); |
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} |
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} |
functional-php /
pattern-matching
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